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5. Dryer Pre-Start Checks
PNEG-552 100 Series Dryer 25
Burner Safety
To check the burner safety function, make sure the main gas valve is OFF. Turn the FAN switch ON and
allow the fan to start. Then, turn the HEATER switch ON. The dryer will shut down after 20 seconds. The
safety message, “loss of flame” will appear.
Heater Test Fire
The following test should be done with grain in the dryer. If no grain is present, set approximate pressure
settings and fine tune when grain arrives. Test fire the burner by starting the fan, and then turn the burner
switch to ON with the fuel supply turned on. The heater should ignite after a short purge delay of
approximately 10 seconds. Gas pressure should be shown on the gauge. At this time, set the high-fire
and low-fire pressure settings. Use the pressure regulator (See #1 on Page 26) for high-fire and the
needle valve located in the side of the Cycle Solenoid (low fire) Valve (See #2 on Page 26) for low-fire.
The burner should cycle between high and low-fire, approximately 2 or 3 times per minute.
Approximate settings should be:
If the burner remains on high-fire and does not cycle, increase the regulator setting on the propane
models, or the supply valve on the natural gas models, in order to reach the thermostat setting. If the
burner remains in low-fire and does not cycle, slightly decrease gas pressure with the low-fire solenoid
needle valve. If the gas pressure is decreased too much, a popping or fluttering sound will be heard. Be
sure to adjust the low pressure needle valve anytime the high pressure regulator is adjusted.
Staged Batch Check
The following test must be done with grain in the dryer or with the air switch turned OFF as noted in the
FAN switch Section on Page 24. To check the staged batch operation, turn the CONTROL POWER
switch to the ON position. Open the main fuel supply valve at the tank on an LP dryer or open the valve
in the fuel supply line on a natural gas dryer. Turn the drying mode switch to the staged batch position.
Turn ON the electric shut off valve to allow fuel flow to the dryer. Turn the load switch to AUTO, the
unload switch to 1 Speed and the fan and burner to ON. Push the dryer power start button and the
controller will sequentially start all dryer components in their proper order. If any switches are not in their
correct position for staged batch operation, the dryer will indicate improper switch position, and will not
start until the switches are in the proper position. After starting, all batch timers will time down in
sequence. When the unload cycle is complete, the timers will automatically reset to their original
settings, and start the dryer timer again.
NOTE: If the dryer is empty, the burner does not operate. The fans cannot create enough static pressure
to engage the air switch. You will receive a “no airflow” message. To start the dryer when it is low
on grain, the airflow switches must be turned OFF. Switching Dip Switch number eight (#8), on
the back of the computer control board, to ON turns the Air Switch OFF.
LP Gas Natural Gas
High-Fire 6-15 lbs. High-Fire 6-10 lbs.
Low-Fire 2-6 lbs. Low-Fire 1-3 lbs.
Dip switch number eight (#8) must be turned back to the OFF position after this
test is complete or no air testing will occur.